All you have to do is visit Paste HTML, enter some code, publish it, and look at what you made. Paste HTML supports HTML, CSS, and JavaScript. You can even use Markdown if you want.

View Source Shows HTML, JavaScript, and CSS Source in Safari on iOS. Thorin Klosowski. November 20, 2014 ... View our Instagram Page (Opens in a new tab) View our Youtube ...

Then, the classNames for the form elements are swithced with JavaScript. Marko also uses JavaScript to preloaded the custom images. Here's an example of his technique from the Nacional news magazine: ...